<template>
	<!-- 
    1. 结构相关
      el-row表示一行，一行分成24份 
       el-col表示列  
       (1) :span="12"  代表在一行中，占12份 (50%)
       (2) :span="6"   表示在一行中，占6份  (25%)
       (3) :offset="3" 代表在一行中，左侧margin份数

       el-form 整个表单组件
       el-form-item 表单的一行 （一个表单域）
       el-input 表单元素（输入框）
    2. 校验相关
       (1) el-form => :model="ruleForm"      绑定的整个form的数据对象 { xxx, xxx, xxx }
       (2) el-form => :rules="rules"         绑定的整个rules规则对象  { xxx, xxx, xxx }
       (3) 表单元素 => v-model="ruleForm.xxx" 给表单元素，绑定form的子属性
       (4) el-form-item => prop配置生效的是哪个校验规则 (和rules中的字段要对应)
  -->
	<el-row class="login-page">
		<el-col :span="12" class="bg"></el-col>
		<el-col :span="6" :offset="3" class="form">
			<!-- 注册相关表单 -->
			<el-form :model="formModel" :rules="rules" ref="form" size="large" autocomplete="off" v-if="isRegister">
				<el-form-item>
					<h1>注册</h1>
				</el-form-item>
				<el-form-item prop="username">
					<el-input v-model="formModel.username" :prefix-icon="User" placeholder="请输入用户名"></el-input>
				</el-form-item>
				<el-form-item prop="password">
					<el-input v-model="formModel.password" :prefix-icon="Lock" type="password"
						placeholder="请输入密码"></el-input>
				</el-form-item>
				<el-form-item prop="repassword">
					<el-input v-model="formModel.repassword" :prefix-icon="Lock" type="password"
						placeholder="请输入再次密码"></el-input>
				</el-form-item>
				<el-form-item>
					<el-button @click="register" class="button" type="primary" auto-insert-space>
						注册
					</el-button>
				</el-form-item>
				<el-form-item class="flex">
					<el-link type="info" :underline="false" @click="isRegister = false">
						← 返回
					</el-link>
				</el-form-item>
			</el-form>

			<!-- 登录相关表单 -->
			<el-form :model="formModel" :rules="rules" ref="form" size="large" autocomplete="off" v-else>
				<el-form-item>
					<h1>登录</h1>
				</el-form-item>
				<el-form-item prop="username">
					<el-input v-model="formModel.username" :prefix-icon="User" placeholder="请输入用户名"></el-input>
				</el-form-item>
				<el-form-item prop="password">
					<el-input v-model="formModel.password" name="password" :prefix-icon="Lock" type="password"
						placeholder="请输入密码"></el-input>
				</el-form-item>
				<el-form-item class="flex">
					<div class="flex">
						<el-checkbox>记住我</el-checkbox>
						<el-link type="primary" :underline="false">忘记密码？</el-link>
					</div>
				</el-form-item>
				<el-form-item>
					<el-button @click="login" class="button" type="primary" auto-insert-space>登录</el-button>
				</el-form-item>
				<el-form-item class="flex">
					<el-link type="info" :underline="false" @click="isRegister = true">
						注册 →
					</el-link>
				</el-form-item>
			</el-form>
		</el-col>
	</el-row>
</template>

<script setup>
	import {userRegisterService,userLoginService} from '@/api/user.js'
	import {User,Lock} from '@element-plus/icons-vue'
	import {ref,watch} from 'vue'
	import {useUserStore} from '@/stores'
	import {useRouter} from 'vue-router'
	const isRegister = ref(false)
	const form = ref()

	// 整个的用于提交的form数据对象
	const formModel = ref({
		username: '',
		password: '',
		repassword: ''
	})
	// 整个表单的校验规则
	// 1. 非空校验 required: true      message消息提示，  trigger触发校验的时机 blur change
	// 2. 长度校验 min:xx, max: xx
	// 3. 正则校验 pattern: 正则规则    \S 非空字符
	// 4. 自定义校验 => 自己写逻辑校验 (校验函数)
	//    validator: (rule, value, callback)
	//    (1) rule  当前校验规则相关的信息
	//    (2) value 所校验的表单元素目前的表单值
	//    (3) callback 无论成功还是失败，都需要 callback 回调
	//        - callback() 校验成功
	//        - callback(new Error(错误信息)) 校验失败
	const rules = {
		username: [{
				required: true,
				message: '请输入用户名',
				trigger: 'blur'
			},
			{
				min: 5,
				max: 10,
				message: '用户名必须是 5-10位 的字符',
				trigger: 'blur'
			}
		],
		password: [{
				required: true,
				message: '请输入密码',
				trigger: 'blur'
			},
			{
				pattern: /^\S{6,15}$/,
				message: '密码必须是 6-15位 的非空字符',
				trigger: 'blur'
			}
		],
		repassword: [{
				required: true,
				message: '请输入密码',
				trigger: 'blur'
			},
			{
				pattern: /^\S{6,15}$/,
				message: '密码必须是 6-15位 的非空字符',
				trigger: 'blur'
			},
			{
				validator: (rule, value, callback) => {
					// 判断 value 和 当前 form 中收集的 password 是否一致
					if (value !== formModel.value.password) {
						callback(new Error('两次输入密码不一致'))
					} else {
						callback() // 就算校验成功，也需要callback
					}
				},
				trigger: 'blur'
			}
		]
	}

	const register = async () => {
		// 注册成功之前，先进行校验，校验成功 → 请求，校验失败 → 自动提示
		// await form.value.validate()
		// await userRegisterService(formModel.value)
		// ElMessage.success('注册成功')
		// isRegister.value = false

		// form.value.validate().then(res=>{
		// 	 ElMessage.success('注册成功')

		// }).catch(res=>{
		// 	console.log(res)
		// 	ElMessage.error('注册失败')
		// })

		form.value.validate((val) => {
			if (val) {
				userRegisterService(formModel.value).then(res => {
					console.log(res)
					ElMessage.success('注册成功')
					isRegister.value = false
				})
			} else {
				ElMessage.error('注册失败')
			}
		})


	}


	const userStore = useUserStore()
	const router = useRouter()
	const login = async () => {
		await form.value.validate()
		const res = await userLoginService(formModel.value)
		userStore.setToken(res.data.token)
		ElMessage.success('登录成功')
		router.push('/')
	}

	// 切换的时候，重置表单内容
	watch(isRegister, () => {
		formModel.value = {
			username: '',
			password: '',
			repassword: ''
		}
	})
</script>


<style lang="scss" scoped>
	.login-page {
		height: 100vh;
		background-color: #fff;

		.bg {
			background: url('@/assets/logo2.png') no-repeat 60% center / 240px auto,
				url('@/assets/login_bg.jpg') no-repeat center / cover;
			border-radius: 0 20px 20px 0;
		}

		.form {
			display: flex;
			flex-direction: column;
			justify-content: center;
			user-select: none;

			.title {
				margin: 0 auto;
			}

			.button {
				width: 100%;
			}

			.flex {
				width: 100%;
				display: flex;
				justify-content: space-between;
			}
		}
	}
</style>